Clean up Dockerfile

lakefile.lean

@@ -1,8 +1,24 @@
 import Lake
 open Lake DSL
 
-require GameServer from  git
-  "https://github.com/leanprover-community/lean4game.git"@"main"/"server"
+def LocalGameServer : Dependency := {
+  name := `GameServer
+  src := Source.path "../lean4game/server"
+}
+
+def RemoteGameServer : Dependency := {
+  name := `GameServer
+  src := Source.git "https://github.com/leanprover-community/lean4game.git" "main" "server"
+}
+
+/- Choose dependency depending on the environment variable NODE_ENV -/
+open Lean in
+#eval (do
+  let gameServerName :=
+    if (← IO.getEnv "NODE_ENV") == some "development" then ``LocalGameServer else ``RemoteGameServer
+  modifyEnv (fun env => Lake.packageDepAttr.ext.addEntry env gameServerName)
+   : Elab.Command.CommandElabM Unit)
+
 
 require mathlib from git
   "https://github.com/leanprover-community/mathlib4.git" @ "fc4a489c2af75f687338fe85c8901335360f8541"